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	<title>我的第一个网页</title>
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		.content-1{font-size: 15px;color: red;}
		.content-2{font-size: 20px;color: yellow;}
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		.content-6{font-size: 20px;color: green;}

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<span class="content-title">静夜思</span>
<h3><span class="content-1">床前</span><span class="content-2">明月</span>光</h3>
<h3><span class="content-3">疑</span>是<span class="content-4">地</span>上霜</h3>
<h3 class="content-5">举头望明月</h3>
<h3>低头思<span class="content-6">故乡</span></h3>
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